不同苜蓿品种的群落结构多为菱形。同化系统与非同化系统的比值随高度的增加而减少。
It's community structure is rhomboid structure, the stem-leaf ratio will decrease with increasing the height of plant.
结果表明所研究的不同化学形态的重金属对白脊藤壶幼体均具较高的毒性，其毒性随重金属浓度及作用时间的增大而呈逐渐上升的趋势。
Results showed that these 5 heavy metals all exhibited high toxicity to B. albicostatus nauplii and the toxicity increased with the concentration and exposure time.
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